BACKGROUND The effect of transcatheter aortic valve replacement (TAVR) on the mitral valve apparatus and factors influencing the reduction of mitral regurgitation with or without mitral leaflet tethering after TAVR are poorly understood. The present 3-dimensional (3D) transesophageal echocardiography study aimed to elucidate early changes further in the structure and function of the mitral valv...

Alternating current preheating (ACP) of lithium-ion batteries has the advantage a high heating rate while inhibiting lithium plating. Two strategies based on terminal voltage control and full battery impedance were proposed to simplify ACP implementation. However, such either severely compromise or induce non-negligible To maximize ensuring no plating, an method anode potential is developed usi...

background several methods for assessment of severity of pain have been proposed but all of them are subjective. objectives this study evaluated the association concerning changes in electrical resistance (er) between two acupuncture points and severity of postoperative pain in order to define an objective measurement of pain. patients and methods in a cross-sectional study, 50 patients undergo...

Also, the power-handling capacity of a transmission line is maximum when it is "flat", i.e., operating at low SWR. Lastly, it is important to be able to interconnect a number of different components into a system, and the only way that can be done reliably and predictably is by constraining the reflection coefficients of the various interfaces through impedance matching. Multiple reflections ca...

normal 0 false false false en-us x-none ar-sa microsoftinternetexplorer4 aim : this study was designed to investigate about findings of impedance ph-monitoring in patients with atypical symptoms of gerd. background : the routine treatment with proton pump inhibitors is not very effective in patients with atypical symptoms of gastro-esophageal reflux disease (gerd). it may be due to non-acid ref...

State parameters such as the state-of-charge (SOC) and state-of-health (SOH) play important role in operation of Li-ion batteries, accurate estimate is prime importance evaluating battery condition guaranteeing safe use. While it difficult to measure SOC SOH directly, internal impedance can be used obtain parameters. Recent studies have shown methods based on pseudo-random binary sequence (PRBS...

Impedance spectroscopy has long been recognized as one of the major techniques for the characterization of ac transport in materials. The primary limitation of this technique is the lack of spatial resolution that precludes the equivalent circuit elements from being unambiguously associated with individual microstructural features. Here we present a scanning probe microscopy technique for quant...

reservoir characterization plays an important role in different parts of an industrial project. the results from a reservoir characterization study give insight into rock and fluid properties which can optimize the choice of drilling locations and reduce risk and uncertainty. delineating hydrocarbon bearing zones within a reservoir is the main objective of any seismic reservoir characterization...

The electromechanical (E/M) impedance method is a powerful technique in active structural health monitoring (SHM). E/M impedance method utilizes as its main apparatus an impedance analyzer that reads the in-situ E/M impedance of piezoelectric wafer active sensors (PWAS) attached to the monitored structure. Present-day impedance analyzer equipments (e.g.HP4194) are bulky, heavy and expensive lab...